Oh sh** gave you the wrong link:
https://cakephp.lighthouseapp.com/projects/42648/tickets/3922-authcomponentredirecturl-prepends-appbaseurl

Guess you understood anyway ;-)

I would do the opposite even though the true fact that links die.
The point of linking the tests to a ticket is to keep "the history" of things together.

We already have a few tests with which are linked to lighthouse.
I don't know if there is a official policy about that though...